An excellent high and low level view of programming Outlook 2000/XP. For an experienced programmer, the majority of the chapters get right into the code/objects/events/models you'll need. The code examples are not "toys", but (fortunately) are brief enough to focus on the subject being discussed.
Novice and experienced programmers will appreciate the overview of the VBA environment/language within Outlook.
Reading this book answered specific questions I needed answered about customization, and erased that "where do I start" feeling I had about programming in Outlook. Great book!